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    <title>13_布尔值.html</title>
    <script type="text/javascript">
        /*
            Boolean 布尔值
                布尔值只有两个值
                true    
                    - 表示真
                false
                    - 表示假
        */

        var bool = true;
        console.log(bool);
        console.log(typeof bool)

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